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Published byErnest Rodgers Modified over 7 years ago

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Place Value & Rounding Review

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Place Value

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For the number 2,641.25 : The 2 is in the ___ place. The 6 is in the ___ place. The 4 is in the ___ place. The 1 is in the ___ place. The 2 is in the ___ place. The 5 is in the ___ place.

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Rounding Whole Numbers Use the term rounding digit - which means: When asked to round to the closest tens - your rounding digit is the second number to the left (ten's place) when working with whole numbers. Example: 345 the underlined 4 is the rounding digit.

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Rounding Whole Numbers Use the term rounding digit - which means: When asked to round to the nearest hundred - the third place from the left is the rounding digit (hundreds place). Example: 345 the underlined 3 is the rounding digit.

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Rules for rounding whole numbers Rule 1: Determine what your rounding digit is and look to the right side of it. If the digit is 0,1,2,3 or 4 do not change the rounding digit. All digits that are on the right hand side of the requested rounding digit will become 0.

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Rules for rounding whole numbers 2.64 = 2.6 For example: The four is less than five so we will drop it.

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Rules for Rounding whole numbers Rule 2. Determine what your rounding digit is and look to the right of it. If the digit is 5,6,7, 8 or 9, your rounding digit rounds up by one number. All digits that are on the right hand side of the requested rounding digit will become 0

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Rules for rounding whole numbers 2.694 = 2.7 For example: The nine is more than five so we will add one to the rounding digit.

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Rules for rounding decimal numbers When rounding numbers involving decimals, there are 2 rules to remember: Rule 1: Determine what your rounding digit is and look to the right side of it. If that digit is 4,3, 2 or 1, simply drop all digits to the right of it.

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Rules for rounding decimal numbers For Example: if rounding to the nearest tenth of 6.422, the 4 becomes our rounding digit, the 2 to the right of it is less than 5, so we simply drop all the digits behind it. 6.422 to the nearest tenth is 6.4

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Rules for rounding decimal numbers Rule 2: Determine what your rounding digit is and look to the right side of it. If that digit is 5, 6, 7, 8 or 9 add one to the rounding digit and drop all digits to the right of it.

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Rules for rounding decimal numbers For Example: if rounding to the nearest tenth of 6.573, The 5 becomes our rounding digit, the 7 to the right of it is more than 5, so we simply add one to the rounding digit. 6.573 to the nearest tenth is 6.6

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